Run pyflakes in lint mode as well

We exclude some files from it as there is no way to make them compliant:

- __init__.py need to import test/model classes for Django to discover
  them
- the settings modules need to share most of the settings
Signed-off-by: Michal Čihař <michal@cihar.com>

.travis.yml

@@ -45,6 +45,7 @@ script:
   - if [[ -z "$DO_LINT" ]] ; then coverage run --source=. ./manage.py test --settings weblate.settings_test $TRAVIS_RUN_TESTS ; fi
   - if [[ -n "$DO_LINT" ]] ; then pep8 --exclude south_migrations,migrations weblate ; fi
   - if [[ -n "$DO_LINT" ]] ; then pylint --reports=n --rcfile=pylint.rc weblate ; fi
+  - if [[ -n "$DO_LINT" ]] ; then pyflakes `find . -name '*.py' -not -name '__init__.py' -not -name 'settings_test_nose.py' -not -name 'settings_test.py'` ; fi
 after_script:
   - coveralls
 matrix:

travis/requirements.txt

 pep8
 coveralls
 pylint
+pyflakes
 selenium
 httpretty!=0.8.1